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Equity (Tables)
6 Months Ended
Jan. 31, 2017
Equity [Abstract]  
Summary of changes in the components of equity

  Six Months Ended
January 31, 2017
 
  Attributable to IDT Corporation  

Noncontrolling Interests

  

Total

 
  (in thousands) 
Balance, July 31, 2016 $123,797  $406  $124,203 
Dividends declared ($0.38 per share)  (8,765)     (8,765)
Restricted Class B common stock purchased from employees  (1,838)     (1,838)
Exercise of stock options  835      835 
Issuance of member interests in CS Pharma Holdings, LLC (see Note 3)  1,850   8,150   10,000 
Distributions to noncontrolling interests     (817)  (817)
Stock-based compensation  2,128      2,128 
Comprehensive income:            
Net income  22,794   758   23,552 
Other comprehensive loss  (2,466)     (2,466)
             
Comprehensive income  20,328   758   21,086 
             
Balance, January 31, 2017 $138,335  $8,497  $146,832